Yoanna- I don't remember Yoanna making a truly bad picture, so I guess I'll say the shoe ad since I can't even remember it.
Shandi- I really didn't like her Eve picture at all, but the worst was the underwater ad....just terrible.
Mercedes- the underwater ad was her worst also, with the sunglasses ad second worst.

Yoanna: Queench (Sorry Yoanna, but you really do look somewhat like a fetus.)
Shandi: Beauty Shot (U-G-L-Y!)
Mercedes: Steve Madden (Sorry, but you kind of look like a gay man trying to have some "sex appeal")